Chair frame



FIG. 1 is a perspective view of new design for a chair frame as shown in the drawings;

FIG. 2 is a front elevation view;

FIG. 3 is a rear elevation view;

FIG. 4 is a left elevation view;

FIG. 5 is a right elevation view;

FIG. 6 is a top plan view;

FIG. 7 is a bottom plan view; and,

FIG. 8 is a reference view showing that a fabric seat is attached to the chair frame. 

CLAIM The ornamental design for a chair frame, as shown and described. 